Method and system for illustrating sound and text

ABSTRACT

A system for displaying audio content with text including a book holder and a book. The book holder identifies which book of a plurality is placed in the holder by detecting magnetic indicators in specific locations and arrangements which are unique to each book. The page of the book which a user views at any given time is identified by detection of ambient light, by detection of a number of circuit elements in parallel, by detection of progressively stacked magnetic sensors, or by microwave reflection.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a divisional of U.S. patent application Ser. No.11/414,103 filed Apr. 28, 2006, which is a divisional of U.S. patentapplication Ser. No. 10/272,062 filed Oct. 16, 2002 and now issued asU.S. Pat. No. 7,111,774 which is a continuation-in-part of U.S. patentapplication Ser. No. 09/557,644 filed Apr. 25, 2000 and now issued asU.S. Pat. No. 6,763,995, which claims the priority of ProvisionalApplication No. 60/147,975 filed Aug. 9, 1999, each of which are herebyincorporated by reference herein.

BACKGROUND OF THE INVENTION

The present invention relates generally to a method and system forillustrating sound and text. More particularly, the present inventionrelates to a method for illustrating sound and text utilizing a bookholder adapted to accept a book with pages including illustrationsand/or text.

Without limiting the scope of the invention, its background is describedin connection with electronic book reader systems. Substantial interesthas long been given by the public to books which include soundillustration related to the text and/or illustration content within thebook. Such sound illustrated books range in the industry from children'sstorybooks to manuals for learning a foreign language. Their popularitystems from the fact that a user can visually follow the text and/orillustration content in the book while listening to the audiblerepresentations corresponding to the text and/or illustration content.

Many sound illustrated books include a book and an audiocassette tape.The book, however, only has text and/or illustrations. It is thecassette tape that contains pre-recorded audio representations (e.g.,voice and/or sound) which correspond with the text and/or illustrationson the pages of the book. In operation, the reader must follow therhythm of the cassette. When the reader reaches a point for turning thepage, a sound or voice instruction is heard indicating such action. If,however, the reader is not following attentively, the audio cassettewill continue delivering audio, representations until stopped manually,or until the cassette reaches its end. As such, the reader may findhim/herself on the wrong page.

Another sound illustrated book system includes a book holder with astylus, wherein the stylus is used to prompt the holder to display audiodepending on what the user presses with the stylus. For example,detectors are placed on the back of a book holder so that when a userselects a given image in the book, the holder (which must know what pagethe user is on) is able to display audio content associated with theparticular image or word indicated with the stylus. Such systemstypically include a particular target which must be depressed by thestylus in order to alert the system that the page has been turned. Thissystem is depicted in FIGS. 1 and 2.

FIG. 1 shows a prior art system which uses a stylus. The system 100includes a book holder 102 and book 104 which is placed in the holder102. Stylus 106 is used to depress selected objects 108, 110, 112 whichare detected by electronics in the holder 102. To accomplish this, theholder is equipped with sensors so that audio content associated with,for example, square 110 is displayed when square 110 is depressed with astylus. This requires that the system know what page the book is on. Gobutton 108 is depressed by the user with the stylus when the page isturned, so that the system knows what page is displayed before the user.

FIG. 2 shows the same system after the page has been turned. Dashedlines represent objects on the previous page, beneath the current page.110 is the square, not behind the current page, as is triangle 112. Onthe current page circle 210 and diamond 212 are shown. The previouspage's go button 108 is noticeably in a different location than thecurrent page's go button 208. This arrangement allows the user to pressgo button 208 once the page has been turned, so that audio contentassociated with circle 210 and diamond 212 will be displayed when thestylus 106 selects those areas.

This system includes some limitations. For example, if a young userforgets to press the go button 208 after turning the page, then theholder will still display audio content associated with the previouspage. In that case, when the user selects circle 210 the audio contentassociated with square 110 is liable to be displayed. Similarly, if theuser accidentally selects the wrong position with the stylus on the lefthand column where the go buttons 108, 208 are located, the system maymistake what page is currently being viewed. Children, who are among thetarget consumers for such book reading devices, may be prone to misapplythe stylus, causing this system to mistakenly display audio contentunassociated with the actual page which the child is viewing.

Other sound illustrated books enjoyed by the public today include pagescomprising a pre-recorded sound chip which includes stored data (e.g.,voice and sound). A problem with this type of sound illustrated book isthat sound chips generally have a limited amount of memory storagecapability. In addition, these chips are directly attached to each page.This can add significantly to the overall weight and girth of the page,or require the use of thick, almost cardboard-like, paper stock. U.S.Pat. No. 6,064,855 describes a system similar to this.

FIG. 3 depicts such a system. The pages 302 are thick enough to containan integrated circuit or chip 304 attached thereto or placed betweenlayers of the pages 302. Such books are more expensive to manufacturethan books without individual chips on each page.

Another common problem is limitation to stored content within thesystem. For example, many book reading systems include cassettes foreach book to be read, the cassette being inserted into the system whenthe book is read. Such systems typically require a new cassette for eachbook to be read. While the cassettes are not usually difficult to workwith, children are less able to manipulate such devices than are adults,and the art would be improved by reducing the need to switch cassettesfor each new book.

SUMMARY OF THE INVENTION

The present invention provides for an electronic book reader system. Theinnovative system preferably includes a book holder, a book, and acassette which contains audio information related to the text of thebook—preferably a reading of that text. Audio cassettes can include textfor a plurality of books, which raises a need for the ability todistinguish different books. This is achieved, in one embodiment, byplacement of magnetic indicators or signatures at specified locations inthe book. The holder is capable of detecting the magnetic signatures.One possible implementation of this innovative approach is described asproviding three locations on a book dedicated to book identification.The presence of a magnetic signature indicates a first state, theabsence of the signature indicates a second state. A binary code is thenassigned for each book, so that the arrangement of the magneticsignatures uniquely identifies books. This allows for a single cassetteto contain audio associated with a plurality of books.

The present invention also provides innovative ways for detecting thepage which a user of the innovative audio book system currently views.In a first embodiment, each page of the book has a reference hole and aprogressive hole. The reference hole is the same size for all pages,while the progressive holes are different size on each page. The holeson the respective pages are aligned so that the reference holes are allstacked and the progressive holes are all stacked. As pages are turned,the amount of light passing through the collected reference holes willremain relatively constant, while the amount of light passing though theprogressive holes increases with each page—and as the smallest of theprogressive holes increases in size. (This requires that the top mostpage have the smallest progressive hole, the holes getting larger as thepages are turned). Photo detectors placed at the proper location(beneath the reference and progressive holes) can detect changes inrelative intensity of the light passing through the collected holes. Thebook holder system uses this information to determine what page the useris viewing, and hence what audio to display.

Another innovative method for detecting the page includes the use ofcircuit elements in parallel. In one example embodiment, resistors areplaced on each page by any of various methods. The resistors andconductive material are so arranged that when the pages are closed, atopone another, they form a circuit wherein a resistor on each individualpage is in parallel with all the resistors, one from each closed page.As a page is opened, that resistor is removed from the parallel circuit.The holder system detects the total resistance of the closed pages, andthereby detects what page the user is currently viewing. This embodimentneed not implement resistors, and a number of potential circuit elementsand arrangements are described, including parallel capacitors andinductors.

Another innovative embodiment includes page detection by means ofaccumulating magnetic field strength on each page. Each page is equippedwith some sort of magnetic field signature, positioned so that as thepages are stacked (e.g., closed), their magnetic field strengthsaccumulate in a distinguishable way. The holder system is equipped withHall effect sensors or similar technology so that the page currentlybeing viewed is detectable by reference to the total accumulatedmagnetic field strength.

Another innovative embodiment includes page detection by means ofreflected microwave radiation. The holder is equipped with a microwavetransceiver. Each page is equipped with a metal structure (for example)so that as pages are stacked, an antenna is formed. The size andreflectivity of the antenna depends on how many pages are closed.Therefore, the holder system can detect what page is currently beingviewed by measuring the amount of microwave radiation reflected by theclosed pages.

These and other innovations are explained more fully in the descriptionwhich follows.

BRIEF DESCRIPTION OF THE DRAWINGS

The novel features believed characteristic of the invention are setforth in the appended claims. The invention itself, however, as well asa preferred mode of use, further objectives and advantages thereof, willbest be understood by reference to the following detailed description ofan illustrative embodiment when read in conjunction with theaccompanying drawings, wherein:

FIG. 1 shows a prior art book reading system.

FIG. 2 shows a prior art book reading system in a different position.

FIG. 3 shows a prior art book reading system which uses integratedcircuits attached to each page.

FIG. 4 shows the innovative system according to a preferred embodiment.

FIG. 5A shows a detail of the innovative system, according to apreferred embodiment.

FIG. 5B shows a detail of the innovative system, according to apreferred embodiment.

FIG. 6 shows a diagram of magnetic signature placement, according to apreferred embodiment.

FIG. 7 shows the detection of magnetic signatures according to apreferred embodiment.

FIG. 8 shows the page detection scheme according to a preferredembodiment.

FIG. 9 shows a page detection embodiment using reference holes andprogressive holes.

FIG. 10 shows a block diagram of the innovative system.

FIG. 11 shows an innovative page detection scheme relying on parallelresistors.

FIG. 12 shows one arrangement according to a preferred embodiment.

FIG. 13 shows a back page arrangement according to a preferredembodiment.

FIG. 14 shows a base unit according to a preferred embodiment.

FIG. 15 shows a block diagram of a page detection scheme according to apreferred embodiment.

FIG. 16 shows a timing diagram of the innovative page detection scheme.

FIG. 17 shows a magnetic coating on a book page according to a preferredembodiment.

FIG. 18 shows an innovative book holder according to a preferredembodiment.

FIG. 19 shows a block diagram of supporting electronics for a preferredembodiment.

FIG. 20 shows a diagram of two pages according to a preferred embodimentwhich includes antennae.

FIG. 21 shows an innovative base unit according to a preferredembodiment, including a microwave transceiver.

DETAILED DESCRIPTION OF THE INVENTION

The description of the present invention has been presented for purposesof illustration and description, and is not intended to be exhaustive orlimited to the invention in the form disclosed. Many modifications andvariations will be apparent to those of ordinary skill in the art. Theembodiment was chosen and described in order to best explain theprinciples of the invention, the practical application, and to enableothers of ordinary skill in the art to understand the invention forvarious embodiments with various modifications as are suited to theparticular use contemplated.

While the making and using of various embodiments of the presentinvention are discussed in detail below, it should be appreciated thatthe present invention provides many applicable inventive concepts whichcan be embodied in a wide variety of specific contexts. The specificembodiments discussed herein are merely illustrative of specific ways tomake and use the invention, and do not delimit the scope of theinvention.

FIG. 4 shows the innovative electronic book reader system forillustrating sound and text consistent with a preferred embodiment. Thesystem 400 includes a book holder 402 which is capable of receiving abook 404 therein. In preferred embodiments, the book 404 is made toaffix within the book holder 402 and is spiral bound. Also in preferredembodiments, the binder includes positions 406 that are designed toreceive some sort of page detection mechanism. The holder 402 includes aslot for receiving a cartridge or cassette 408 that includes audiocontent for display with the book 404.

In a preferred embodiment, the cassette 408 is inserted into the holder402 as is the book 404. The book holder 402 detects which book has beenplaced therein (described more fully below) and when the book is opened,the holder displays audio associated with that page or “open position”of the book. As pages of the book are turned, the system detects whatpage is open to the reader, and displays audio associated with thatpage. The system for identifying the page is described more fully below.

In a preferred embodiment, cassette 408 includes audio contentassociated with more than one book. Such a capability requires that thesystem be able to identify which book is placed in the book holder aswell as identify the page that particular book is on at a given moment.

FIGS. 5A and 5B show more detailed views of the book and holder of thepresent system. In FIG. 5A, the book 504 is bound with spiral wirethrough holes in the book. Between the holes described by the bindingare positions 506 at which are placed, in one embodiment, magneticsignatures or another means for detecting the page to which the book isopen. Holder 502 is also shown. (It should be noted that the particularform of binding is not intended to limit the invention, and spiralbinding is only an example.)

FIG. 5B shows the same system but focuses on the bottom of the binding.Positions 506 are shown. In one preferred embodiment, the innovativesystem detects which book 504 is placed in the holder 502 by noting theplacement or absence of indicators (e.g., magnetic signatures) atspecific positions 506. For example, on one embodiment, the bottom threepositions 506A, 506B, 506C are dedicated to identifying the book. Inthis embodiment, there are enough positions 506 so that every set ofopen pages of the book 504 corresponds to a position, with threepositions 506A-C left over. In other words, if there are ten openpositions of pages of the book in this embodiment (i.e., the book hasten open positions), then thirteen magnetic signatures at positions 506are required.

The first (top) ten positions 506 are used to determine what pages areopen to the reader, while the bottom three 506A-C are used to identifythe book itself. This is accomplished by associating a particular bookwith a particular binary code represented in the bottom three positions506A-C. For example, a first book is associated with the binary code“001” which is represented on the book itself by placing a magneticsignature (or other identifying apparatus, described below) at the 506Cposition, while leaving the 506A, 506B positions open. Hence, theabsence of a signature represents a binary “0” while the presence of asignature represents a binary “1”. In this way, a plurality of books canbe uniquely identified by the positioning of signatures at the bottomthree positions. Three positions dedicated to identification of the bookcan uniquely identify 8 books. Binary coding is preferred for thissystem, but other codes could be used according to the kind ofsignatures used.

In a preferred embodiment, the cassette 408 includes audio contentassociated with a plurality of books. The cassette also containsinformation so that when a book 504 is placed in the holder 502, thesystem 400 can identify the book 504 by reading the bottom threepositions 506A-C for signatures. This is, in a preferred embodiment,accomplished by sensors that detect the presence or absence of asignature at the positions 506. The sensors are preferably hidden withinthe holder 502 and positioned near where the book binding lies when thebook 504 is within the holder 502. This and other page detection systemsconsistent with preferred embodiments are described more fully below.

If three positions 506A-C are reserved for book identification, and ifbinary coding is used, then up to eight unique book identities can berecognized. Hence, a single cassette 408 can contain audio content foreight unique books. This allows a book to be removed and another bookplaced in the holder without the need to replace the cassette 408 aswell. When a new book 504 is placed in the holder 502, the system 400reads the bottom three positions 506A-C and identifies the book. It isthen capable of displaying the correct audio content associated withthat book. More or fewer positions may of course be dedicated to theidentification of books. And though the book identification aspect ofthe present invention has been described with reference to magneticsignatures, other detection schemes may also be implemented consistentwith preferred embodiments.

FIG. 6 shows a schematic of the positions and dimensions of the pagebindings and magnetic signatures in an example embodiment. This exampleshows the association of magnets 602A-N with pages in the book. Notethat only the open positions of the book need be identified, so inpractice every other “page” must be represented by a magnetic signatureat a position. In a preferred embodiment, the placement of magneticsignatures 602A-N corresponds to the positions 506 from FIG. 5. Twopotential arrangements are detailed, with different dimensions given.The specific implementation of the signatures is not intended to limitthe scope of the invention, and the dimensions are only offered as anexample.

In this figure, it is noted that the bottom three positions 506M, 506N,5060 are preferably used for book identification. In this case, thebinary representation would be “110” since the positions 506M, N havemagnetic signatures 602M, N placed there, while position 5060 has nomagnet.

Though book identification has been described as dedicating the bottomthree positions 506 to book IDs, books may be identified by dedicatingany particular set of positions 506 to the book identification process.Also, though the positions are shown as being spaced between the holdsof the spiral binding, any arrangement of signatures suffices, whetheron the binding or outer edge of the book. Furthermore, the positions 506dedicated to book identification need not be contiguous.

The present invention now describes page detection innovationsconsistent with a preferred embodiment.

In a first embodiment, page detection is described with reference to amagnetic detection system. With reference to FIG. 7, therein is shownthe relationship between the magnetic signatures 24 and the magneticsignature sensor 26. In one embodiment, a book may include five (5)pages 20, each containing illustrations and/or text therein. Therefore,each of the five (5) pages 20 will include a magnetic signature 24 whichis attached at a specified location on each of page 20. The magneticsignatures 24 are small in size and will not require the page, or pages20 to be significantly altered.

The reading surface 14 of the system comprises a magnetic signaturesensor 26 which includes one or more individualized reading elements 28.In one embodiment, only five (5) of the reading elements 28 will beused. The reading elements 28 are pre-aligned on the reading surface 14in order to correspond with the magnetic signatures 24 at theirspecified locations on each of the pages 20.

A user will then place the book containing five (5) of pages 20 on thereading surface 14. As the user views the illustrations and/or text onPage 1, the magnetic signature 24 on Page 1 will be detected by thereading element 28 of the magnetic signature sensor 26 corresponding tothe magnetic signature 24 on Page 1. As the magnetic signature 24 ofPage 1 comes into contact with the corresponding reading element 28, aLow (L) voltage signal will be depicted as shown in FIG. 8. The othermagnetic signatures 24 will remain in a High (H) state until detected.Such signal from the corresponding sensor will then communicate withlogic contained within the reading controller. It is the logic whichenables the reading controller to retrieve the electronic equivalentrepresentations corresponding to the text and/or illustrations on Page 1and deliver them to a speaker.

This sequence will then continue with the user turning to Page 2, whichincludes illustrations, and/or text. As shown in FIG. 8, while the useris viewing Page 2, two Low (L) voltages will be detected. This will,however, indicate that the user is on Page 2, and thus, retrieve theassociated audio content for delivery in an audible manner to the user.Only the electronic equivalent representations corresponding to the textand/or illustrations on Page 2 will be delivered to the user. Noadditional sound will be heard until the user decides to turn to Page 3.As such, the user can control the speed of his/her reading of the bookfor enjoyment purposes.

Another embodiment of the present invention comprises page detectionusing photo sensors. FIG. 9 shows an example implementation of thisinnovative system. The book 902 includes pages 904, 906, 908 each ofwhich has holes 910, 912 placed therein. In a preferred embodiment, theholes are placed near the binding of the book.

Each page has a reference hole 910 and a progressive hole 912. Thereference holes 910 are all the same diameter, while the progressiveholes 912A, 912B, 912C increase in size as more pages are turned. Thepages have magnetic coating near the holes to keep the pages intact.

Photo detectors 918, 920 are positioned to detect light passing throughthe progressive holes and reference holes, respectively. The photodetectors are connected to a circuit board 922 that allows processing ofinformation. Photo detectors 918, 920 and circuit board 922 arepreferably part of book holder or base unit 916.

As each page is turned during use of the system, the size of referenceholes 910 remains the same, while the size of the progressive holes 912gets bigger with each page. Hence, photo detector 920 will detect auniform amount of light no matter what page is viewed by the user, whilephoto detector 918 receives increasing amounts of light with each pageturned. In a preferred embodiment, photo detector 918 will experience aminimum amount of light at the first page and a maximum amount of lightat the last page, with step-wise increments of light in between witheach turning of a page.

FIG. 10 shows a detail of the electronics used in a preferredembodiment. Detectors 918, 920 are connected to switch 1002 which iscontrolled by CPU 1006. The switch toggles back and forth so as tocontinually monitor the light received by both photo detectors 918, 920.Detectors 918, 920 convert light into analog voltage output, which isconverted to a digital signal by A/D converter 1004. The digital signalfrom A/D converter 1004 is fed to the CPU 1006. The CPU 1006 analyzesthe data of each page to determine what page is currently open. In apreferred embodiment, it does this by referring to a predeterminedweight code table.

Another embodiment of the present innovations includes using resistanceto detect what page a reader is on. FIGS. 11, 12, 13, and 14 show thisembodiment.

FIG. 11 shows a block diagram of the innovative page detection system.The pages of the book include conductive tape or paint along withresistors, so that when the pages are closed the resistances of all thepages are combined in parallel. This is represented as Rp 1102 in FIG.11. Each page has a finite resistance, which is preferably made by usinga chip resistor or resistive paint applied to the pages. Since all thepages are electrically connected, the voltage at the output terminal ornode 1112 is the total parallel resistances of the combined pages. Pageswhich have already been opened do not contribute to this total, so thatonce a page has been turned, the total resistance changes in adetectable way. The page is then determined by comparing the measuredtotal resistance with a predetermined weight code table.

The resistors in parallel 1102 are connected to a voltage source 1104and another resistor 1106. Output node 1112 serves as a point at whichto measure the resistance of the circuit. The voltage at this point 1112is compared to the table, which includes voltage values corresponding tothe known resistances for any given page position of the book. In apreferred embodiment, maximum voltage is produced at the output terminal1112 on the first page and minimum voltage is produced on the last page.

The analog output voltage is preferably converted to a digital signal byanalog-to-digital converter 1108 before being analyzed by CPU 1110.

FIG. 12 shows the front of a typical page of a book consistent with apreferred embodiment. The front of a page 1200 includes two sections ofelectrical conductive tape or conductive paint 1202 separated by aresistor 1204 of some description, preferably resistive paint or a thinchip resistor. The page also has a magnetic coating 1206 to keep thepages, and their conductivity, intact. The front of each page of thebook preferably includes these or analogous structures.

FIG. 13 shows the back of a page 1300 in a preferred embodiment of theinnovative system. The page includes electrical conductive tape or paint1302 in two sections, separated by insulation or not connected at all.The front conductive sections 1202 and the back conductive sections 1302of a given page are preferably in contact with one another, preferablythrough the page itself, so that when multiple pages are closed one atopthe other, the pages form a circuit that has the resistors of each pagein parallel with one another. In this manner, the front conductivesections 1202 of one page contacts the back conductive sections 1302 ofanother page. Stacking pages thereby puts the resistors in parallelrelative to voltage source 1104.

FIG. 14 shows the base unit 1400 in which the book sits when the systemis in operation. Base unit 1400 includes electrical conductive tape orpaint 1402 in two separate strips, similar to the configuration for theback of each page. Each of the strips 1402 is connected to the circuitboard 1404 in the base unit 1400. The strips 1402 connect the circuitboard 1404 to the strips and resistors on each page such that thecircuit board sees the combined resistors in parallel. With each turningof a page, the number of resistors is decreased, allowing the system todistinguish what page a user is currently viewing.

FIGS. 15 and 16 show another means to determine what page a user iscurrently viewing. This method includes the use of capacitors ratherthan resistors in a similar configuration as that shown in FIGS. 11-14.The pages are equipped as they are shown in FIGS. 12, 13, and 14, exceptthat capacitors are used in place of resistors on the front of eachpage, so that the closed book comprises capacitors in parallel andconnected to the circuit board in the book holder or base unit.

FIG. 15 shows the innovative system having capacitors in parallel 1502connected to an AC voltage source 1504 and a resistor 1506. Node 1522serves as an output point for the voltage of the circuit.

Placing capacitors in parallel increases total capacitance, and hence,it increases the pulse width measured at node 1522. This pulse width isfed into an AND gate 1514. The AND gate has two inputs, including thatfrom node 1522 and another reference input 1510 which depends on clock1512. The pulse width generated by clock 1512 preferably produces pulsewidths that are on a scale with the narrowest pulse widths liable to beproduced by the combined capacitors 1502. The AND gate 1514 outputs aresulting pulse 1516 which is fed into counter 1518, and then isprocessed by CPU 1520. CPU 1520 compares the final measurement to apredetermined weight code table to distinguish what page the user isreading. Capacitance, and hence pulse width at node 1522, is maximum forthe first page of the book and minimum for the last page in this scheme.

FIG. 16 shows a timing diagram for the pulse widths shown in FIG. 15 as1508, 1510, and 1516. Tp3 1516 gives positive voltages when both inputs1508, 1510 are positive. This provides a relative scale for the voltageat node 1522 so that different pages can be distinguished.

Though these embodiments have been described with reference to resistorsand capacitors, the invention can also be modified to use other circuitcomponents, such as inductors. The particular implementation is notintended to limit the scope of the idea embodied in these examples.

FIGS. 17-19 show another embodiment of the present innovations. Thissystem for detecting pages includes the use of magnetic strips andmagnetic sensors. FIG. 17 shows a typical page in the innovative bookfor the system. The page 1702 includes an area (preferably near thebinding) coated with a magnetic material 1704. Each page includes such acoating. The coating not only helps keep the pages intact, but alsoallows for accumulation of magnetic field strength caused by thecoatings when the pages of the book are closed atop one another.

FIG. 18 shows the base unit 1802 of the innovative system, includingmagnetic coating 1808, magnetic sensors 1804 (such as Hall effectsensors) located in a position analogous to the positioning of themagnetic coatings on each of the pages, so that when the book is closedthe sensor is located near or beneath the coatings of the pages. Thesensor 1804 is connected to the electronic circuit board 1806. Themagnetic sensor 1804 detects a magnetic field of strength depending onthe number of pages which are closed—i.e., which are positioned atop thesensor. The stacked pages accumulate magnetic field strength as seen bythe sensor, so that the field strength is maximum at the first page andminimum at the last page. By comparing the magnetic field strength seenby the sensor 1804, the page to which the book is opened is determined.

FIG. 19 shows a block diagram of the magnetic field sensor 1902, ananalog-to-digital converter 1904, and CPU 1906. The sensor 1902 passesanalog information about the magnetic field strength of the combinedclosed pages of the book to the A/D converter 1904, which passes theconverted digital information to the CPU for processing and pagedetermination.

FIGS. 20 and 21 depict another embodiment of the present innovations.This embodiment relies on reflection of microwaves or other appropriateelectromagnetic energy to determine what page a user currently views.

In FIG. 20, the second to last page 2002 and the last page 2004 areshown side-by-side. The images of the pages are truncated. Magneticcoating 2006 is applied to each page, preferably near the binding. Onthe last page 2004 is positioned a metal tape or other structure 2010with the qualities of being electrically conductive and capable ofreflecting electromagnetic energy. Second-to-last page 2002 includes ametal tape or similar structure 2008 positioned at an offset locationrelative to tape 2010 on page 2004. With both pages closed, the antenna2008, 2010 overlap to form a single antenna which reflects a greateramount of microwaves emitted from transceiver (shown in FIG. 21). Hence,as each page is closed, the effective antenna length, and microwavereflectivity, is enhanced. The reflectivity is at maximum with all pagesclosed, and at minimum when only the last page remains. In a preferredembodiment, the antennae 2008, 2010 are each individual segments ofroughly equal length, though other embodiments include progressivelylonger segments, each extending farther than the antenna segment on thepage after it. The antenna segments are preferably electricallyconnected.

FIG. 21 shows the base unit 2102 with magnetic strip 2104, along withmetal tape 2106 attached to antenna 2108. Antenna 2108 emits microwaveradiation generated by microwave transceiver 2110 and receives reflectedradiation from the antennae located on the pages above the base unit.The antennae of the pages will reflect more or less radiation dependingon the size of the antenna, and hence the number of pages which areoverlaid. By distinguishing the differences in reflected microwaveradiation, the current page being viewed can be determined. Note thatthough this embodiment is described with respect to microwave radiation,other types of electromagnetic energy can also be used, provided theenergy is of a wavelength and character such that the pages themselvesare relatively transparent and such that the energy can be reflected byantennae attached to the pages.

1. A system for displaying audio with text, comprising: a book and abook holder designed to receive the book, the book having a plurality ofpages; wherein at least some of the pages of the book each include afirst hole, the first holes all being substantially the same size;wherein at least some of the pages of the book each include a secondhole, wherein the second holes all differ in size from one another. 2.The system of claim 1, wherein when the plurality of pages of the bookare overlaid, the first holes are aligned with one another.
 3. Thesystem of claim 1, wherein when the plurality of pages of the book areoverlaid, the second holes are aligned with one another, and wherein adifferent amount of electromagnetic energy passes through the holesdepending on how many pages are overlaid.
 4. The system of 3, furthercomprising first and second detectors in the book holder, the firstdetector being positioned to detect electromagnetic energy passingthrough the first holes, the second detector being positioned to detectelectromagnetic energy passing through the second holes.
 5. The systemof claim 3, wherein the electromagnetic energy is ambient light.
 6. Thesystem of claim 1, further comprising means for comparing the relativeintensity of the electromagnetic energy passing through first holes withthe energy passing through the second holes.
 7. The system of claim 1wherein the book includes electrical components attached to at leastsome of the pages.
 8. The system of claim 7, wherein the electricalcomponents are resistors.
 9. The system of claim 7, wherein theelectrical components are inductors.
 10. A system for displaying audiowith text, comprising: a book holder designed to receive a book, thebook having a plurality of pages; a conductive material placed on eachpage of the plurality of pages; a resistive material placed on each pageof the plurality of pages; wherein the conductive material and theresistive material on each page of the plurality forms a circuit whenthe pages of the plurality are overlaid such that the resistive materialof each page is in parallel with the resistive material of the otherpages of the plurality.
 11. The system of claim 10, wherein the circuitincludes a node, and wherein the measured voltage at the node indicateswhich page of the plurality is currently being viewed by a user.
 12. Thesystem of claim 10, wherein the circuit includes components located inthe book holder.
 13. A system for displaying audio with text,comprising: a book holder designed to receive a book, the book having aplurality of pages, the book holder including an electromagnetic energytransceiver; a first antenna on a first page of the book; a secondantenna on a second page of the book; wherein when the book is in afirst open position, the first antenna reflects a first amount ofelectromagnetic energy emitted from the transceiver; wherein when thebook is in a second open position, the first page and second page areoverlaid and the first and second antennae reflect a second amount ofelectromagnetic energy from the transceiver.
 14. The system of claim 13,wherein the system determines what page of the book is currently beingviewed depending on the amount of energy reflected back to thetransceiver.